I think in the coming two decades paper money will be vanished and will be replaced by the new form of payments , now in first world like euro zone,USA and Russia many prefer not to use the paper money , so only grand mothers\fathers believe else than that . i hope Bitcoin and other alts will play a basic role in the future regard to this .
We've been on the way to becoming a cashless society for a while now. ATM cards are largely replacing your actual currency, and credit cards become like mini-loans to extend the cash you don't have on hand that you weren't using anyway because you have a debit card
